Calculating-machine.



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APPLICATION HLEO 0CT.22. I912.

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CALCULATING MACHINE.

APPUICATION FILED OCT. 22. 1912.

Patented Jan. 15,1918.

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CALCULATING MACHINE.

' APPLICATION FILED 0cT.22. 1912. 1,253,310, Patented Jan. 15,1918.

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APPLICATION FILED ocT.22. 1912.

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Patented Jan. 15, 1918.

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APPLICATION 'HLED 001122. 1912.

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CALCULATING MACflINE.

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CALCULATING MACHINE.

APPLICATION FILED ocT.22.1912.

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4. 7 5% f M A??? RICHARD VON REPPERT, OF ST. LOUIS, MISSOURI.

CALCULATING-MACHINE.

I Specification of Letters Patent.

Patented Jan. 15, 1918.

7 Application filed October 22, 1912. Serial No. 727,159.

To all whom it may concern: Be it known that I, RICHARD VON REPPnR'r, a citizen of the United States, residing at St. Louis, State of Missouri, have invented certain new. and useful Improvements in Calculating-Machines, of which the following is a specification.

My invention relates to'calculating machines and has for its general object the construction of a machine that performs'the four fundamental calculations, addition, subtraction, multiplication and division, as well a otheruseful commercial work, in a practical manner; a machine whose work is absolutely accurate and subject to visual control, and one that can be operated with very little manual effort at great speed.

Other objects are, to provide a machine in which the item or items, the accumulated total, and the multiplier or quotient, respectively, are visually displayed onnumeral disks; to provide a machine having movable decimal point lugs to be used primarily in conjunction with multiplication and division to point oil the decimal places on the numera-l disks; to provide a machine having a flexible and speedy key action by arranging that a depressed key 1s restored to its normal position by the operation of another key; to provide an item entering and item wheel clearing device actuated by the operating lever, the moving parts being so arranged that continuous movement of the operating lever is transformed into movement of tne clearing device having gradually diminishing velocity, in order to equalize the resistance of the item members and gear trains and to avoid shocks to the machine, to provide an item mechanism having spring-driven item members mounted in a carriage and arranged to be set to represent an item and simultaneously to move into proper cotiperative position with the totalizing mechanism; to provide key actuated stop devices to release and set the item members 'so arranged that an item member is released by the actuation of a key and the stop member is positioned and remains p0- sitioned until after the actuation of a second key, thereby givin the item members ample time to assume t e desired position when the keys are most rapidly actuated; to provide a totalizing mechanism of novel and simple construction in which all parts have positlve constraint motion and are positively locked against accidental movement in all phases the machine assumes; to provide a totalizing mechanism which automatically reverses when subtracting movement is imparted to the total wheels; to provide a machine havin a train lock to lock the several trains ag'alnst accidental movement and unlock as many trains as are engaged by item wheels; to provide a machine having a. series of movable gear sectors which are permanently connected to the type sectors and which are arranged to move simultaneously to engage both the itemwheels and a series of gears connected with the total wheels to thereby establish positive operative connection between the item wheels, the total wheels and the type sectors; to provide an item retaining device of novel and simple construction arranged to lock the retaining pawls of the item members in the respective positions at which they have been set by the keys, thereby to retain a set up item for repeated'addition or subtraction as is necessary for multipli:

cation and division; to provide a machine having a printing fmechanism arranged to be split so that two columns of figures may be added and printed without showing ciphers between the two columns; to provide a machine in which certain of the total wheels can be eliminated from receiving entering, movement so that the type sectors corresponding to these total wheels can be utilized for printing numbers not to be added or subtracted; to provide a machine arranged to print two columns of figures and having means for adding and printing the total of one of said columns of figures;

to provide a machine having a clearing device for the total wheels, actuated by the operating lever and arranged to transform continuou and uniform movement of the operating lever into movement of gradually diminishing velocity to equalize the resistance of the clearing trains and to avoid shocks to the machine; to provide means for insuring that the actuating lever shall be -moved to its full stroke, thus insuring a complete cycle of operations; to provide a machine having positive locking means controlled by the actuating lever for preventing operation of the figure keys,

back-spacing key, adding and subtractin keys, total and sub-total keys during the ll forward and return stroke of the actuating lever; to provide a lock for the total key to lock the same against operation when the item wheel carriage is out of normal position; to provide a lock for the. item wheel carriage to lock the same in normal position by the operation of the total key; to provide a latch for the total key to lock the same in depressed position, and means to unlatch the same by the operation of the error key, to provide a machine arranged to automatically print the minus sign adjacent to each item entered while the machine is set for subtraction; to provide a machine that can be locked in printing or non-printing position so that all items entered are respectively either printed and accumulated or only accumulated and not printed;

The expression set up as employed in this specification refers to the. movement of parts in proportion to the figures of an item or amount.

The expression positive constraint motion as employed in this specification refers to the movement of parts by means under positive mechanical control without the employment of prings or yielding elements.

These objects, and others as will appear hereinafter, are accomplished in the calculating machine illustrated in the accom' panying drawings forming part of this specifi cat1on. The improvements and combinations of parts constituting my invention are fully set forth in the following description,

and will be pointed out with particularity in the appended claims.

In the drawings, in which like symbols are used to designate like parts wherever they appear,

Figure 1 is a side view of the complete machine;

F ig. 2 is a. rightside elevation thereof with the casing removed;

Fig. 3 is a left side elevation thereof with the casing removed;

Fig. 4 is a partial front elevation thereof with the front part of the casing removed;

Fig. 5 is a rear'elevation thereof with the casing removed;

Fig. 6 is a plan view thereof with the casing removed;

Fig. 7 is longitudinal section on the line AB inFig. 6; I v

Fig. 8 is a front detail view of the key mechanism and key-repulsing device;

Fig. 9 is a side detail view showing a key and the parts actuated thereby in moved position; I

Fig. 10 is a plan detail view of the item wheel carriage;

Fig. 11 is a sectional-view of the item wheel carriage and a side detail view of the back-spacing device; i

Fig. 12 is a sectional view of two adjacent item wheels, the springs being omitted;

Fig. 13 is a detail of the back-spacing device as seen from the left in Fig. 11;

Fig. 14 is a side detail view of the operating lever connections, showing the shockpreventing devices, the actuating means for the item-wheel clearing mechanism, and the left side plate of the key-board and the parts thereon actuated by the operating lever;

Fig. 15 is a detail view of the clearing mechanism actuating levers in actuated position.

Fig. 16 is a left side detail view, showing the connections of the repeat, error and subtotal keys, the actuating mechanism for the gear-sector rocking frame, and the lever actuating the printing mechanism, paper and ribbon feed, and lock therefor for locking these parts in operative or inoperative position;

Fig. 17 is a part cross-section and part front elevation of the mechanism behind the key-board, some of the'parts being omitted;

Fig. 18 is a detail view of the printing mechanism, showing a type sector and hammer in moved position;

' Fig. 19 is a view of a part of the right side of the casing showing the paper carriage and paper feed mechanism in end elevation;

Fig. 20'is a. view of a part of the left side of the casing, showing the ribbon feed mechanism in side elevation;

Fig. 21 is a top view of a portion of the casing showing the end of the lever for actuating the printing mechanism and lock for locking the same in operative or inoperative position; I

Fig. 22 is a perspective view of the total wheel gear train arrangement and the carrying mechanism, I showing the carrying parts in normal position and the 200 set in adding position;

Fig. 23 is a detail view, partly broken away, of the carrying mechanism, showing a carrying train set for addition;

Fig. 24 is a similar detail view of the carrying mechanism, showing a train in the act of carrying;

Fig. 25 is a right side detail View. showing the connections of the adding, subtracting and total keys and the locks therefor; also the carriage lock, the drive mechanism for the carrying mechanism andv the clearing pinions, and the mechanism for rocking the frame carrying the gear sectors;

Fig. 26 is a front detail view of a total wheel gear train arrangement, the gear 200 being shown in full lines in position for addition and in dotted lines in position for subtraction and clearing; 

